Casing for steam pipes and the like



Feb. 10, 1925. f 41,525,758

J. H. NICHOLLS cAsING Fon STEAM PzPEs AND THE LIKE Filed Jun 18, 19'25 4 Patented Feb. 10, 1925.

UNITED STATES `JAMES HOCKINNIGHO'LLS, OF NAPIER, NEW ZEALAND.

CASN'G FOR STEAM PIIPES AND THE LIKE.

`.lipplication ledw'une 18,

To all whom t may concern."

` Be it known that I, JAMES Hoonnv NiortoLLs, citizen ot the Dominion ot New Zealand, residing' at 6 Carlyle Street, Napier, in the Provincial District ot Hawkes Bay, New Zealand, have invented an Improved Casing tor Steam Pipes and the like, of which the following is a` specification.

This invention relates to coverings placed on steam and ammonia pipes and the like and has for its object the provision ot' an improved casing, whereby not only are said pipes enabled to be co-vered in abetter manner than heretofore but joints and leakages are enabled to be quicklylooated, time and material are saved and better protection is givento the lagging against the effects of weather, vermin and ordinary wear and tear. According to the invention theimproved casing is formed from sheet metal orother springy material and is in short lengths or sections capable of being opened and placed over the lagging or covering on the pipes, without being slid thereon from an end ot' the pipe.

Each short length or section contains a vent and can if desired be slightly larger at one endl than at the other end to take the smaller end of an adjoining` length or section, or it can be provided with endsthrough which the pipe passes without contacting or sections can be divided longitudinally into halves and hinged together at one side, theopposite meeting edges of the halves being secured together by a pin.

In another it'orm the halves of the sec` tions have their edges bent so as to be capable of being inter-engaged said halves slid togetherV longitudinally, the ends of the halves not being slid flush with each other in order that the joints between the sections willnot continue right around thepipe. In a` further torni each short length or section `is cut longitudinally along one side only, the lengths or sections being sprung `open to `encircle the pipe and itscovering and the meeting edges afterwards Secured together by bolts, or by being doubled so as to engage or hook the one-in the other.

i Longitudinal strips: or fins can be secured along the inside of the sho-rt lengths or Sections in order to prevent the lagging or covering from Working around the pipe.

Casings for bends are formed by securing 1923. serial No. 646,269.

together overlapping strips ot sheet metal bent to a circular formation each strip narrowing towards the inner side of the pipe bend, in order to give the casing the necessary shape, said casing being cut along its inner side so as to be capable of being sprung open and placed over the bend and its covering, the meeting edges being then bolted together. Other shapes of casings tor elbows, Ts and the like are constructed 1n a similar manner. Flanged joints in a pipe line are enclosed by separate sections of casing of a greater diameter than the ordinary sections.

' The invention will however be further described with the aid of the accompanying drawing wherein l Figure 1 is a cross sectional view and Figure 2 an elevation of a vsection ot one tormjot the casing and a'portion oi pipe therein.

Figure 3 is a cross sectional view and Figure 4 an elevation showing a further form. g

Figure 5 is a longitudinal sectional elevation showing another form, and a method ot enclosing a flanged pipe joint.

Figure 6 Ais a cross sectional view of a casing cut longitudinally at one side and with means foruniting the edges thereof, also showing internal ribs or lins. with said pipe. In one fo-rmthe lengths Figure 7 is a longitudinal sectional elevation showing the securing together of sections with socketed ends.

Figure 8 shows the method ot forming a casing for a bend and Figure 9 is a cross sectional view ot a casing cut longitudinally along one side and provided with inter-engaging edges.

In the form shown in Figures l and 2, each short length or section; ot casing is divided longitudinally into halves l, 2 capable of being slid together in order to vbe united around the lagging or covering 3 and pipe 4e. As shown in the drawing one of the halves has its edges turned inwards and then outwards in order to provide grooves 5 in which the inturned edges 6 of the other half can be slid. It desired each halt can be provided at one edge with a gro-ove 5 and on the opposite side with an inturned edge 6 to mate with an inturned edge 6 and a groove 5 respectively on the other halt. j o

The halves l and 2 when secured around CII the pipe 4 do not have their ends flush but are lett as shown in Figure 2 with each half projecting beyond they other at opposite ends. As each section is treated t-he saine, the joints made between the short lengths or sections of casing are brokeiiordo not continue right around the pipe 4.

The section is first placed around .the pipe 4, and the end pushed into or jointed with a preceding section, the lagging is then packed into the section the pressure on the internal surface otrthe section holding the flanges of the section in` rigid engagenient.

The -form of casing in Figures 3 and 4 shows a short length or sectionx of casing divided loiligitudinally into halves 1, 2 as before, said halves being hinged together along one side as at 7 so as to be capable. ol being opened out and placed around the lagging or covering 3 around r`the pipe The other edges ofthe halves 1, 2 are rolled as at. 8 each rolled edge being recessedor cut away at intervals to receive portions of the other rolled edge sorthat va pin 8a can be passed through the alignedI rolled portions, oi' interengaging rolled edges,and so hold the two halves 1, 2, together` around the lagging 3 or covering and the, pipe 4.

The sectionsmay. have inturned or flanged ends 10, Figure 5, whichV when used are prevented 'rloin makingy contact with the pipe 4 and flanges 4a thereof, or withthe ends ot adjacentsections, by insulating ina-- terial 9.

In a further forni each section 19 Y (Fig ure 6) canbe in one piece with one side cut longitudinally to enable it to be opened and sprung over the pipe 4 and lagging or covering 3 thereon, vthe meeting edgesof the section being secured together' by being made to overlap'v and by bolts 11 passed through the overlapping portions.

The sections canbe made' to overlap the ends of preceding sections bybeingprovided with sockets 12, the overlapping ends being bolted together (Figure 7) or by said sect-ions being tapered from one` end to the other, the larger end of each` sectionreceiving the sinallei'end of an adjacent section and being bolted thereto.

Internal ribs or stripsl (Figure 6) secured longitudinally in the, sections are pro-- vided at each side oli' the latter near the top thereof to prevent the lagging or covering 3 from slipping around in the casing and uncovering theV topv or crown of the pipes, where the protection or insulation is niost needed.

Sections of casing for bends are formed by overlapping circular strips 14 of sheet metal towards the inner curve of'tliebend, (Figure 8) in `order to give the section the required shape and riveted together and cut on theinner side so as to enable them to be sprung over the pipe 4 and covering, and to be bolted together thereon in similar manner to the other sections,

Sections of casing for elbows and Ts can also be formed, the sections in all cases being made. to overlap, so that they can be bolted together or otherwise united.

Jointsiii pipe lines are not covered by the sections of casing, the latter being made to terminate a Short distance from and be ing insulatedfroin the langes 4a of the joint (Figure 5) after which a separate shorter sectionvlof larger diameter than the other sectionsis secured around theunited pipe flanges 4a and coveringthereon,.said larger sections 15 serving as pipe jointA indicators.

In using bolts and nuts to connect sections orto bolt together overlapping edges, the nuts 11iL are secui'ed on` the. inside of the inner edge, eachi opposite or. registering with, a hole in the latter. Holes t inthe other edge are made to register with the holes oppositewhich the nuts11a are secured,v whereupon the bolts l1 can be screwed into the nuts 11a throughathe registering holes, from the outside of the casing, in lorder to clamp the overlapping edges y togethen When a leakage occurs in a pipe, the position of same islocated by the issue of steam or the like through the nearest opening ina section. Not` only. is time thereby saved inl locating the leak, but lagging or coveringfenclosed by other sections l'is not damaged, and needv not be` removed orr re- Placed.

Where pipesare located outside buildings or are exposed to the weather, the sheet inetal casing affords ellicient protection against the effects of the weather.

In the forni shown in Figure 9 each section 20 isfcut longitudinally along oneside` one edge being doubled or. turned 'inwards as at 17y and the other edge being doubled or turned outwards as at 18. To placev and .secure the section 20 on the pipe 4 it is sprung open and made to encircle the latter, the doubled edges 17 and 18 being caused to engage or hookthe one inthe other as shown, the outward pressure, of the lagging or covering 3 packed in the annular space between the casing and the pipe, keeping said edges 17 and 18 in engagement with each other. j

Having now particularly. described and ascertained the-natureot iny said invention and in `what inanner the saine is to be performed, I declare that what I claim is:-

1. A casing for steam and other pipes,

comprising, a plurality of sections, certain of the sections being provided with vents.

2. A casing for steam and other pipes, according to claim l, the sections being out longitudinally along one side to permit them to be opened out and placed around the pipe, the edges at the sides of the cut being then p secured together.

3. A casing for steam and other pipes, according to claim l, the sections being cutlongitudinally along one side to permit them to be opened out and placed around the pipe, the edges at the sides of the cut being then secured together', the edges at the sides of the out being bent to provide interengaging portions.

4;. A casing for steam and other pipes formed in short sections, each section being provided with intnrned ends through Which a pipe passes, when the casing is in position.

5. A casing for steam and other pipes formed in short sections in combination with lengths of larger diameter for encircling pipe joints, the lengths and sections being out of Contact With the pipe, and eac-l1 length being gripped between two adjacent sections, When in position.

6. A casing for steam and other pipes, comprising, overlapping connected strips, bent to a circular formation, said strips narrowing at one side to make the casing conform to a pipe bend, the casing being out at the inside of the bend, to enable it to be placed on the pipe bend, and means for securing the cut edges together.

JAMES HOGKIN NIGHOLLS. 

